pH determination device



FIG. 1 is a frontal view;

FIG. 2 is a rear view;

FIG. 3 is a right edge view, the left edge being the same;

FIG. 4 is a bottom view of the device; and,

FIG. 5 is a top view of the device. 

I claim the ornamental design for a pH determination device, substantially as shown and described. 